Hello all,
 
after update gradle to 2.10.0 sync will fail with error (1.5.0 will work):
 
failed to find target with hash string 'Symbol Technologies, Inc.:EMDK 3.1 (API 19):19' 
 
I spent a huge time to solve this. May it will help you...
 
My build.gradle uses the target (described in docs by zebra):
 
compileSdkVersion 'Symbol Technologies, Inc.:EMDK 3.1 (API 19):19' 
 
Problem:
 
The EMDK in my android SDK has these files in the top directory:
 
localhost:addon-symbol_emdk-symbol-19 ah$ ls -l total 24 drwxr-xr-x  3 ah  staff   102 24 Jun  2015 docs drwxr-xr-x  3 ah  staff   102 24 Jun  2015 libs -rw-r--r--  1 ah  staff   773 18 Jun  2015 manifest.ini -rw-r--r--  1 ah  staff  1169 13 Jul 07:43 package.xml -rw-r--r--  1 ah  staff   421 13 Jul 07:42 source.properties localhost:addon-symbol_emdk-symbol-19 ah$  
A deeper look into source.properties shows the main problem here.
### Android Tool: Source of this archive. #Wednesday June 17,2015 Addon.NameId=symbol_emdk Pkg.Desc=Android + EMDK APIs Addon.VendorId=symbol Addon.Vendor=Symbol Technologies, Inc. Pkg.License="" Pkg.LicenseRef="" Pkg.DescUrl="" Archive.Arch=ANY Addon.NameDisplay=EMDK 3.1 (API 19) Addon.VendorDisplay="Symbol Technologies, Inc." Archive.Os=ANY Pkg.SourceUrl="" Pkg.Revision=38 AndroidVersion.ApiLevel=19               
I found two possible ways to solve it.
 
See the line with the key "Addon.VendorDisplay". Remove the double quotes and delete the package.xml.
 
Addon.VendorDisplay=Symbol Technologies, Inc. 
Run your sync again. The package.xml will re-created and my project was build.
 
Alternatively leave the files untouched and modify your build.gradle instead.
 
compileSdkVersion '"Symbol Technologies, Inc.":EMDK 3.1 (API 19):19' 
 
We use many Flavor builds. So chang ing  EMDK's source.properties is much less work...
 
At least the directory convention of the EMDK directories is wrong. Append "--debug" or "--info" to "gradlew" to see much more...This point will not affect the sync or my build but floods my console and logs.
 
The directories should looks like:
 
localhost:add-ons ah$ ls -l drwxr-xr-x   7 ah  staff  238 12 Jul 14:42 addon-symbol_emdk-symbol-16 drwxr-xr-x   7 ah  staff  238 13 Jul 07:55 addon-symbol_emdk-symbol-19 
 
Best regards
André